body,html 
  line-height: 1
  font-weight: 200
  font-family: 'PingFang SC','STHeitiSC-Light','Helvetica-Light',Arial, Helvetica, sans-serif

.clearfix
  display block
  &:after
    display: block
    content: "."
    height: 0px
    line-height: 0px
    clear: both
    visibility: hidden
    
@media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio: 1.5)
  .border-1px
    &::after
      -webkit-transform: scaleY(0.7)
      transform: scaleY(0.7)
@media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio: 2)
  .border-1px
    &::after
      -webkit-transform: scaleY(0.5)
      transform: scaleY(0.5)